During WWI pretty German master spy Helene von Lorbeer is sent undercover to London to live with the family of a high-placed British official where she is to rendezvous with the butler Valdar, also a spy, and help him transmit secret war plans back to Germany.

Drummond's wedding with Phyllis is interrupted when the inspector guarding their gifts is killed. He tries to trace the killers and uncovers the mystery of diamond counterfeiters.

Peggy is a gangster's moll from New Jersey, living a pampered life in Manhattan with three French maids. Blue bloods from England have invited her to tea this afternoon; she's looking forward to her initiation into high society. She takes a Rolls to a club where she's greeted by a team of fakers who plan to sell her a membership in an exclusive but fictive club - for $25,000. As Peggy tries to be refined, will the grifters succeed in the con?

A popular aristocrat has been killed, but no one can learn how. No one, that is, until the return of Sherlock Holmes.